An Analytic Calculation Method for Natural Torsional Frequency of Bellows

This method considers a bellows as an equivalent tube with the same torsional stiffness and mass, taking the mean radius of the bellows as the tube radius, and introducing sectional integration method of revolutional shells to calculate the torsional stiffness of the bellows, to analyze the torsional vibration model of the tube. Finite element method is used to executing eigenvalue analysis for the bellows, and its results about the torsional natural frequencies of the bellows verify the analytical calculation method mentioned above, and prove the availability and accuracy of the analytical calculation method.